<template>
  <div>
    <el-card class="box-card">
      <div slot="header" class="clearfix">
        <span>文章列表</span>
      </div>
      <!-- 搜索区域 -->
      <div class="search-box">
        <el-form :inline="true" :model="q">
          <el-form-item label="文章分类">
            <el-select
              v-model="filter.cate_id"
              placeholder="请选择分类"
              size="small"
            >
              <el-option
                v-for="item in cateList"
                :key="item.id"
                :label="item.cate_name"
                :value="item.id"
              ></el-option>
            </el-select>
          </el-form-item>
          <el-form-item label="发布状态" style="margin-left: 15px">
            <el-select
              v-model="filter.state"
              placeholder="请选择状态"
              size="small"
            >
              <el-option label="已发布" value="已发布"></el-option>
              <el-option label="草稿" value="草稿"></el-option>
            </el-select>
          </el-form-item>
          <el-form-item>
            <el-button type="primary" size="small" @click="restList"
              >筛选</el-button
            >
            <el-button type="info" size="small" @click="reseSearch"
              >重置</el-button
            >
          </el-form-item>
        </el-form>
        <!-- 发表文章的按钮 -->
        <el-button
          type="primary"
          size="small"
          class="btn-pub"
          @click="showPubDialog"
          >发表文章</el-button
        >
      </div>
      <!-- 文章表格区域 -->
      <el-table :data="artList" style="width: 100%" border stripe>
        <el-table-column label="文章标题" prop="title">
          <template v-slot="scope">
            <el-link type="primary" @click="showDetail(scope.row.id)">{{
              scope.row.title
            }}</el-link>
          </template>
        </el-table-column>
        <el-table-column label="分类" prop="cate_name"></el-table-column>
        <el-table-column label="发表时间">
          <template v-slot="{ row }">
            {{ row.pub_date | dateFormat }}
          </template>
        </el-table-column>
        <el-table-column label="状态" prop="state"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="scope">
            <el-button type="danger" size="mini" @click="remove(scope.row.id)">
              删除</el-button
            >
          </template>
        </el-table-column>
      </el-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="q.pagenum"
        :page-sizes="[2, 3, 5, 10]"
        :page-size="q.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 发表文章的 Dialog 对话框 -->
    <el-dialog
      title="发表文章"
      :visible.sync="pubDialogVisible"
      fullscreen
      :before-close="handleClose"
      @closed="onDialogClosed"
    >
      <el-form
        :model="pubForm"
        :rules="pubFormRules"
        ref="pubFormRef"
        label-width="100px"
      >
        <el-form-item label="文章标题" prop="title">
          <el-input v-model="pubForm.title" placeholder="请输入标题"></el-input>
        </el-form-item>
        <el-form-item label="文章分类" prop="cate_id">
          <el-select
            v-model="pubForm.cate_id"
            placeholder="请选择分类"
            style="width: 100%"
          >
            <!-- 循环渲染分类的可选项 -->
            <el-option
              :label="item.cate_name"
              :value="item.id"
              v-for="item in cateList"
              :key="item.id"
            >
            </el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="文章内容" prop="content">
          <!-- 使用 v-model 进行双向的数据绑定 -->
          <quill-editor
            v-model="pubForm.content"
            @blur="$refs.pubFormRef.validateField('content')"
          ></quill-editor>
        </el-form-item>
        <el-form-item label="文章封面" prop="cover_img">
          <!-- 用来显示封面的图片 -->
          <img
            src="../../../assets/images/cover.jpg"
            alt=""
            class="cover-img"
            ref="imgRef"
          />
          <br />
          <!-- 文件选择框，默认被隐藏 -->
          <input
            type="file"
            style="display: none"
            accept="image/*"
            ref="iptFileRef"
            @change="onCoverChange"
          />
          <!-- 选择封面的按钮 -->
          <el-button type="text" @click="$refs.iptFileRef.click()" class="btn"
            >+ 选择封面</el-button
          >
        </el-form-item>
        <el-form-item>
          <el-button type="primary" size="small" @click="add('已发布')"
            >发布</el-button
          >
          <el-button size="small" type="info" @click="add('草稿')"
            >存为草稿</el-button
          >
        </el-form-item>
      </el-form>
    </el-dialog>
    <!-- 查看文章详情的对话框 -->
    <el-dialog title="文章预览" :visible.sync="detailVisible" width="80%">
      <h1 class="title">{{ artDetail.title }}</h1>

      <div class="info">
        <span>作者：{{ artDetail.nickname || artDetail.username }}</span>
        <span>发布时间：{{ artDetail.pub_date | dateFormat }}</span>
        <span>所属分类：{{ artDetail.cate_name }}</span>
        <span>状态：{{ artDetail.state }}</span>
      </div>

      <!-- 分割线 -->
      <el-divider></el-divider>

      <!-- 文章的封面 -->
      <img
        :src="'http://big-event-vue-api-t.itheima.net' + artDetail.cover_img"
        alt=""
      />

      <!-- 文章的详情 -->
      <div v-html="artDetail.content" class="detail-box"></div>
    </el-dialog>
  </div>
</template>

<script>
// 导入默认的封面图片
import defaultImg from "@/assets/images/cover.jpg";
export default {
  name: "ArtList",
  data() {
    return {
      // 查询参数对象
      q: {
        pagenum: 1,
        pagesize: 2,
        cate_id: "",
        state: "",
      },
      pubForm: {
        title: "",
        cate_id: "",
        // 文章的内容
        content: "",
        cover_img: null,
        // 文章的发布状态，可选值有两个：草稿、已发布
        state: "",
      },
      pubFormRules: {
        title: [
          { required: true, message: "请输入文章标题", trigger: "blur" },
          {
            min: 1,
            max: 30,
            message: "文章标题的长度为1-30个字符",
            trigger: "blur",
          },
        ],
        cate_id: [
          { required: true, message: "请选择文章标题", trigger: "change" },
        ],
        content: [
          { required: true, message: "请选择文章内容", trigger: "blur" },
        ],
        cover_img: [
          { required: true, message: "请选择图片", trigger: "change" },
        ],
      },
      filter: {
        cate_id: "",
        state: "",
      },
      // 文章分类
      cateList: [],
      // 文章的列表数据
      artList: [],
      total: 0,
      // 控制文章详情对话框的显示与隐藏
      detailVisible: false,
      // 文章的详情信息对象
      artDetail: {},
      pubDialogVisible: false,
    };
  },
  methods: {
    // 关闭事件的处理函数
    async handleClose(done) {
      // 询问用户是否确认关闭对话框
      const confirmResult = await this.$confirm(
        "此操作将导致文章信息丢失, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      // 取消了关闭
      if (confirmResult === "cancel") return;
      // 确认关闭
      done();
    },
    //初识化文章分类列表数据
    async initCasteList() {
      const { data: res } = await this.$http.get("/my/cate/list");
      //   console.log(res);
      if (res.code !== 0) return this.$message.error(res.message);
      this.cateList = res.data;
    },
    // 展示发布文章的对话框
    showPubDialog() {
      this.pubDialogVisible = true;
    },
    onCoverChange(e) {
      const files = e.target.files;
      if (files.length === 0) {
        this.pubForm.cover_img = null;
        this.$refs.imgRef.setAttribute("src", defaultImg);
      } else {
        this.pubForm.cover_img = files[0];
        const url = URL.createObjectURL(files[0]);
        this.$refs.imgRef.setAttribute("src", url);
      }
      this.$refs.pubFormRef.validateField("cover_img");
    },
    // 1. 创建 FormData 对象pub
    add(state) {
      //   console.log(state);
      this.pubForm.state = state;
      this.$refs.pubFormRef.validate(async (valid) => {
        if (!valid) return;
        // 1. 创建 FormData 对象
        const fd = new FormData();
        // 2. 向 FormData 中追加数据
        for (let k in this.pubForm) {
          fd.append(k, this.pubForm[k]);
        }
        // 3. 发起请求
        const { data: res } = await this.$http.post("/my/article/add", fd);
        if (res.code !== 0) return this.$message.error(res.message);
        this.$message.success(res.message);
        // 4. 关闭对话框
        this.pubDialogVisible = false;
      });
    },
    onDialogClosed() {
      this.$refs.pubFormRef.resetFields();
      this.pubForm.content = "";
      this.pubForm.cover_img = null;
      this.pubForm.state = "";
      this.$refs.imgRef.setAttribute("src", defaultImg);
    },
    async initArtList() {
      const { data: res } = await this.$http({
        method: "get",
        url: "/my/article/list",
        params: {
          ...this.q,
        },
      });
      if (res.code !== 0) return this.$message.error(res.message);
      this.artList = res.data;
      this.total = res.total;
    },
    handleSizeChange(newSize) {
      this.q.pagesize = newSize;
      this.pagenum = 1;
      this.initArtList();
    },
    handleCurrentChange(newPage) {
      this.q.pagenum = newPage;
      this.initArtList();
    },
    restList() {
      this.q.cate_id = this.filter.cate_id;
      this.q.state = this.filter.state;
      this.q.pagenum = 1;
      this.initArtList();
    },
    reseSearch() {
      this.filter = {
        cate_id: "",
        state: "",
      };
      this.q = {
        state: "",
        cate_id: "",
      };
    },
    // 根据 id 删除文章
    async remove(id) {
      // 1. 询问用户是否要删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      // 2. 取消了删除
      if (confirmResult === "cancel") return;

      // 执行删除的操作
      const { data: res } = await this.$http.delete("/my/article/info", {
        params: { id },
      });

      if (res.code !== 0) return this.$message.error(res.message);
      this.$message.success(res.message);

      if (this.artList.length === 1 && this.q.pagenum > 1) {
        this.q.pagenum--;
      }
      // 刷新列表数据
      this.initArtList();
    },
    async showDetail(id) {
      const { data: res } = await this.$http.get("/my/article/info", {
        params: {
          id,
        },
      });
      if (res.code !== 0) return this.$message.error(res.message);
      this.artDetail = res.data;
      this.detailVisible = true;
    },
  },
  created() {
    this.initCasteList();
    this.initArtList();
  },
};
</script>

<style lang="less" scoped>
.search-box {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  .btn-pub {
    margin-top: 5px;
  }
}
.title {
  font-size: 24px;
  text-align: center;
  font-weight: normal;
  color: #000;
  margin: 0 0 10px 0;
}

.info {
  font-size: 12px;
  span {
    margin-right: 20px;
  }
}
/deep/ .ql-editor {
  min-height: 300px;
}
// 设置图片封面的宽高
.cover-img {
  width: 400px;
  height: 280px;
  object-fit: cover;
}
.btn {
  width: 110px;
  height: 44px;
  border: 1px solid #d9d9d9;
}
.el-pagination {
  margin-top: 15px;
}
</style>
